IBM eserver pSeries 690, Руководство пользователя

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Recovery Procedures
Situations such as line noises and power surges can sometimes cause your modem to
enter an undefined state. When it is being used for dial-in, dial-out or ring indicate
power-on, your modem is initialized each time one of these actions is expected. If one
of these environmental conditions occur after your modem has been initialized, it might
be necessary to recover your modem to a known state.
If your modem communicates correctly with remote users, it is probably in control. It
may be wise to occasionally change some of the functional settings and then change
them back, just for the sense of security that the modem is communicating, and to
ensure it has been initialized recently.
If your system is particularly difficult to access physically, another strategy is to protect it
with an Uninterruptible Power Source (UPS) and a phone-line surge protector.
In case recovery becomes necessary, shut down your system using established
procedures. Disconnect the power cable and press the power button to drain
capacitance while power is disconnected. Disconnect and reconnect modem power, and
then reconnect system power to completely reinitialize your system.
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Eserver
pSeries 690 User’s Guide